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Abstract:

Sound generated by a sound emitting unit passes through a first sound
passage defined between a first shielding board and a shielding cylinder
and a second sound passage defined between a second shielding board and
the shielding cylinder, and is emitted outside from a sound emitting hole
defined in at least one of a case and a cover. The second shielding board
and the shielding cylinder shield a space between the sound emitting hole
and the first sound passage when the first sound passage is seen from the
sound emitting hole.

Claims:

1. A sound producing device for a vehicle comprising: a case having a
cylindrical part and a separation wall disposed in the cylindrical part
to separate inside of the case into a first space and a second space, the
separation wall having a through hole through which the first space and
the second space communicate with each other, the cylindrical part having
an opening open to outside from the second space; a sound emitting unit
arranged in the first space to close the through hole; and a cover
covering the opening of the cylindrical part, wherein the case has a
shielding cylinder arranged in the second space to surround the through
hole, the shielding cylinder protruding from the separation wall toward
the cover, the cover has a first shielding board arranged in the
shielding cylinder to cover the through hole, a first sound passage being
defined between the first shielding board and an inner circumference
surface of the shielding cylinder, sound generated by the sound emitting
unit passing through the first sound passage, and a second shielding
board arranged to oppose an opening of the shielding cylinder to cover
the first sound passage, a second sound passage being defined between the
second shielding board and an axial end of the shielding cylinder, sound
coming from the first sound passage passing through the second sound
passage, at least one of the cylindrical part of the case and the cover
has a sound emitting hole through which sound coming from the second
sound passage is emitted outside, and the second shielding board and the
shielding cylinder shield a space between the sound emitting hole and the
first sound passage when the first sound passage is seen from the sound
emitting hole.

2. The sound producing device according to claim 1, wherein the sound
emitting hole is located at the lowest position in the second space.

3. The sound producing device according to claim 1, wherein the sound
emitting hole is one of a plurality of sound emitting holes, the
cylindrical part of the case has a first sound emitting hole
corresponding to the sound emitting hole, and the cover has a second
sound emitting hole corresponding to the sound emitting hole.

4. The sound producing device according to claim 1, wherein the axial end
of the shielding cylinder opposes to the cover and extends to a point
between the first shielding board and the cover, and whole of the first
shielding board is received inside of the shielding cylinder to produce a
level difference between the axial end of the shielding cylinder and a
surface of the first shielding board opposing to the second shielding
board in an axis direction of the shielding cylinder.

5. The sound producing device according to claim 1, wherein the first
shielding board has a diameter smaller than a diameter of the second
shielding board.

Description:

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is based on Japanese Patent Application No.
2011-138497 filed on Jun. 22, 2011 and Japanese Patent Application No.
2012-118880 filed on May 24 2012, the disclosures of which are
incorporated herein by reference in their entirety.

TECHNICAL FIELD

[0002] The present disclosure relates to a sound producing device for a
vehicle.

BACKGROUND

[0003] JP-A-2006-101287 describes a sound producing device for a vehicle.
The sound producing device includes a case, a sound emitting unit
arranged in the case, and a cover that covers the case. A side of the
unit, from which sound is emitted, is covered by the cover, and the cover
has a sound emitting hole. The sound producing device is arranged in a
front bumper of the vehicle. When the vehicle is washed using
high-pressure water, the high-pressure water may pass through the sound
emitting hole and collide with the sound emitting unit, so that the sound
producing device further includes a shielding board. The shielding board
is configured to receive the high-pressure water, and is fixed to the
cover.

[0004] However, the shielding board may be sometimes ineffective if the
high-pressure water comes from an oblique direction relative to the
cover, while the shielding board can receive the high-pressure water
coming perpendicularly to the front face of the cover. If the
high-pressure water collides with the sound emitting unit, the sound
emitting unit may be damaged by the high-pressure water.

[0005] Moreover, snow adhering to the cover may be pushed into the sound
producing device through the sound emitting hole by wind pressure
received when the vehicle is traveling. If the snow adheres to the sound
emitting unit, the sound emitting unit may be damaged. Further, sound
pressure or quality emitted from the sound producing device may be varied
if the snow adheres to the sound emitting unit.

SUMMARY

[0006] It is an object of the present disclosure to provide a sound
producing device that is restricted from having damage and variation in
the sound pressure or quality.

[0007] According to an example of the present disclosure, a sound
producing device for a vehicle includes a case, a sound emitting unit,
and a cover. The case has a cylindrical part and a separation wall
disposed in the cylindrical part to separate inside of the case into a
first space and a second space. The separation wall has a through hole
through which the first space and the second space communicate with each
other. The sound emitting unit is arranged in the first space to close
the through hole. The cylindrical part has an opening open to outside
from the second space, and the cover covers the opening of the
cylindrical part. The case has a shielding cylinder arranged in the
second space to surround the through hole, and the shielding cylinder
protrudes from the separation wall toward the cover. The cover has a
first shielding board and a second shielding board. The first shielding
board is arranged in the shielding cylinder to cover the through hole. A
first sound passage is defined between the first shielding board and an
inner circumference surface of the shielding cylinder, and sound
generated by the sound emitting unit passes through the first sound
passage. The second shielding board is arranged to oppose an opening of
the shielding cylinder to cover the first sound passage. A second sound
passage is defined between the second shielding board and an axial end of
the shielding cylinder, and sound coming from the first sound passage
passes through the second sound passage. At least one of the cylindrical
part of the case and the cover has a sound emitting hole through which
the sound coming from the second sound passage is emitted outside. The
second shielding board and the shielding cylinder shield a space between
the sound emitting hole and the first sound passage when the first sound
passage is seen from the sound emitting hole.

[0008] Therefore, when the vehicle is washed using high-pressure water,
the high-pressure water is received by the second shielding board and the
shielding cylinder so that the high-pressure water is restricted from
entering the first sound passage. Accordingly, the sound producing device
is restricted from having damage and variation in the sound pressure or
quality.

[0009] Further, if snow is pushed into the second space through the sound
emitting hole by wind pressure generated when the vehicle is traveling,
the snow is restricted from entering inside of the shielding cylinder,
due to the shielding cylinder and the first shielding board. Accordingly,
the sound producing device is restricted from having damage and variation
in the sound pressure or quality.

[0010] For example, the sound emitting hole is located at the lowest
position in the second space.

[0011] Thus, the water or snow entering the second space can be discharged
outside with reliability.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other objects, features and advantages of the present
disclosure will become more apparent from the following detailed
description made with reference to the accompanying drawings. In the
drawings:

[0013] FIG. 1 is a perspective view illustrating a sound producing device
according to an embodiment;

[0014] FIG. 2A is a front view illustrating the sound producing device,
FIG. 2B is a side view illustrating the sound producing device, and FIG.
2C is a bottom view illustrating the sound producing device;

[0015] FIG. 3 is a cross-sectional view taken along a line III-III of FIG.
2A;

[0016] FIG. 4 is a cross-sectional view taken along a line IV-IV of FIG.
2A;

[0017] FIG. 5 is a front view illustrating the sound producing device
without a cover;

[0018] FIG. 6A is a front view illustrating the cover of the sound
producing device, FIG. 6B is a side view illustrating the cover of the
sound producing device, and FIG. 6C is a back view illustrating the cover
of the sound producing device;

[0019] FIG. 7 is a cross-sectional view taken along a line VII-VII of FIG.
6A; and

[0020] FIG. 8 is a cross-sectional view taken along a line VIII-VIII of
FIG. 6A.

DETAILED DESCRIPTION

Embodiment

[0021] An embodiment will be described with reference to FIGS. 1-8.
Up-and-down direction shown in FIG. 2A is defined when a sound producing
device of the embodiment is mounted to a vehicle. The sound producing
device is used as, for example, an alarm device for the vehicle, or a
device that informs an approach of another vehicle.

[0022] As shown in FIG. 1, the sound producing device has a case
constructed by a first casing 1, a second casing 2, and a cover 3. The
first casing 1, the second casing and the cover 3 are made, of resin.

[0023] As shown in FIGS. 3 and 4, the first casing 1 has an approximately
cylindrical portion 11 having a first opening and a second opening. The
disc-shaped second casing 2 is gas-tightly coupled to the first opening
of the cylindrical portion 11 using a welding, and the disc-shaped cover
3 is fitted to the first casing 1 to cover the second opening of the
cylindrical portion 11.

[0024] A separation wall 12 is arranged in the cylindrical portion 11, and
inside space of the cylindrical portion 11 is divided into two parts in
the axis direction. Specifically, a first space 4 is defined by the
cylindrical portion 11, the separation wall 12 and the second casing 2,
and a second space 5 is defined by the cylindrical portion 11, the
separation wall 12 and the cover 3.

[0025] As shown in FIG. 5, the separation wall 12 has a round through hole
13 that causes the first space 4 and the second space 5 to communicate
with each other. As shown in FIGS. 3 and 4, a sound emitting unit 6 is
arranged in the first space 4 to close the through hole 13, and generates
sound in response to an electric signal. The sound emitting unit 6 is
gas-tightly connected to the separation wall 12 using a welding. As shown
in FIG. 3, a connection terminal 7 is pressed into the first casing 1,
and electrically connects the sound emitting unit 6 to an external
harness (not shown).

[0026] As shown in FIG. 4, the first casing 1 has a shielding cylinder 14
that surrounds the through hole 13 and protrudes from the separation wall
12 toward the cover 3. The shielding cylinder 14 is arranged in the
second space 5.

[0027] The cover 3 has a disc-shaped first shielding board 31 arranged in
the shielding cylinder 14 to cover the through hole 13. More
specifically, an axial end of the shielding cylinder 14 opposing to the
cover 3 extends to a point between the first shielding board 31 and the
cover 3, and the whole of the first shielding board 31 is received inside
of the shielding cylinder 14 to produce a level difference between the
axial end of the shielding cylinder 14 and a surface of the first
shielding board 31 opposing to the second shielding board 32 in the axis
direction. A first sound passage 81 is defined between an outer
circumference surface of the first shielding board 31 and an inner
circumference surface of the shielding cylinder 14, and sound generated
by the sound emitting unit 6 flows through the first sound passage 81.
The first sound passage 81 continuously extends along the circumference
direction of the shielding cylinder 14.

[0028] The cover 3 has a disc-shaped second shielding board 32 arranged to
oppose an axial opening of the shielding cylinder 14 to cover the first
shielding board 31 and the first sound passage 81. The first shielding
board 31 and the second shielding board 32 are arranged to be layered in
the axis direction of the shielding cylinder 14. As shown in FIG. 6C, the
diameter of the first shielding board 31 is smaller than the diameter of
the second shielding board 32. The center of the first shielding board 31
is offset from the center of the second shielding board 32. More
specifically, the first shielding board 31 is arranged to have the same
axis as the sound emitting unit 6, and the center of the second shielding
board 32 is offset from the center of the sound emitting unit 6.

[0029] A second sound passage 82 is defined between a surface of the
second shielding board 32 and an axial end of the shielding cylinder 14.
Sound passing through the first sound passage 81 is introduced into the
second sound passage 82 that continuously extends along the circumference
direction of the shielding cylinder 14.

[0030] As shown in FIGS. 1 and 4, the cover 3 has a cylinder portion 33
and a flange portion 34. The cylinder portion 33 extends from an outer
circumference edge of the second shielding board 32 in the axis direction
of the shielding cylinder 14 in a direction away from the second casing
2. The cylinder portion 33 has an axial end opposite from the second
casing 2, and the flange portion 34 extends outward in the radial
direction from the axial end of the cylinder portion 33.

[0031] The cylinder portion 33 of the cover 3 has a sound emitting hole 83
through which the sound passing through the second sound passage 82 is
emitted outside. The sound emitting hole 83 is an opening defined by
cutting a part of the cylinder portion 33 in the circumference direction.
Specifically, in FIG. 1, left half of the cylinder portion 33 is
separated into four parts in the circumference direction, and only the
sound emitting hole 83 is the opening. Other three parts are closed. As
shown in FIG. 6C, the sound emitting hole 83 is defined at two positions
slightly upper side from the center section of the cylinder portion 33 in
the up-and-down direction of FIG. 1.

[0032] The cylindrical portion 11 has a sound emitting hole 84 through
which the sound passing through the second sound passage 82 is emitted
outside. The sound emitting hole 84 is defined on an axial end part of
the cylindrical portion 11 adjacent to the cover 3, as shown in FIG. 1.
The sound emitting hole 84 is arranged at plural positions along the
circumference direction of the cylindrical portion 11. One of the plural
holes 84 is defined at the lowest position of the second space 5.

[0033] The sound emitting hole 83 of the cover 3 and the sound emitting
hole 84 of the cylindrical portion 11 communicate with outside of the
sound producing device. The sound output from the sound emitting unit 6
is emitted outside from the sound emitting hole 83 and the sound emitting
hole 84.

[0034] Position relationship of the second shielding board 32, the first
sound passage 81, and the sound emitting hole 83 will be described with
reference to FIG. 4. When the first sound passage 81 is seen from the
sound emitting hole 83, a space between the sound emitting hole 83 and
the first sound passage 81 is shielded by the second shielding board 32,
so that the sound emitting unit 6 cannot be recognized from outside of
the sound generating device.

[0035] Position relationship of the second shielding board 32, the
shielding cylinder 14, the first sound passage 81, and the sound emitting
hole 84 will be described with reference to FIG, 4. When the first sound
passage 81 is seen from the sound emitting hole 84, a space between the
sound emitting hole 84 and the first sound passage 81 is shielded by the
second shielding board 32 and the shielding cylinder 14, so that the
sound emitting unit 6 cannot be recognized from outside of the sound
generating device.

[0036] The sound producing device is arranged out of a passenger
compartment of the vehicle. More specifically, the sound producing device
is arranged in a front bumper of the vehicle in a manner that the cover 3
is located on the front side rather than the first casing 1 and the
second casing 2. When electricity is supplied to the sound producing
device, sound output from the sound emitting unit 6 passes through the
first sound passage 81 and the second sound passage 82, and is emitted
outside as a warning sound from the sound emitting hole 83 and the sound
emitting hole 84.

[0037] When the vehicle is washed using high-pressure water, if the
high-pressure water enters the second space 5 through the sound emitting
hole 83 or the sound emitting hole 84, the high-pressure water is caught
by the second shielding board 32, and is restricted from flowing into the
first sound passage 81. The water received by the second shielding board
32 is discharged out of the sound producing device from the sound
emitting hole 84 located at the lowest position in the second space 5.
Therefore, water does not reach the sound emitting unit 6, so that the
sound emitting unit 6 can be restricted from having damage. The second
shielding board 32 has a predetermined dimension to restrict a foreign
object such as high-pressure water or snow from having a direct contact
with the sound emitting unit 6 by traveling linearly in the second sound
passage 82 and the first sound passage 81 when the foreign object enters
the second space 5 through the sound emitting hole 83, 84.

[0038] Moreover, if snow adhering to the surface of the cover 3 is pushed
into the second space 5 through the sound emitting hole 83 or the sound
emitting hole 84 by wind pressure generated when the vehicle travels, the
shielding cylinder 14 and the first shielding board 31 restrict the snow
from entering the shielding cylinder 14. The snow melts soon and is
discharged out of the sound producing device from the sound emitting hole
84 located at the lowest position in the second space 5. Therefore, the
snow does not reach the sound emitting unit 6, so that the sound emitting
unit 6 can be restricted from having damage and functional disorder.

[0039] In the embodiment, the sound emitting hole 83 is defined in the
flange portion 34 of the cover 3, and the sound emitting hole 84 is
defined the cylindrical portion 11 of the first casing 1. Alternatively,
the sound emitting hole may be defined at least one of the flange portion
34 of the cover 3 and the cylindrical portion 11 of the first casing 1.

[0040] Such changes and modifications are to be understood as being within
the scope of the present disclosure as defined by the appended claims.